| TAKS Objective | 3. The student will demonstrate an understanding of the interdependence of organisms and the environment. |
| Knowledge and Skill Statement | (4) Science Concepts. The student knows that cells are the basic structures of all living things and have specialized parts that perform specific functions, and that viruses are different from cells and have different properties and functions. The student is expected to |
| Student Expectation |
(D) identify and describe the role of bacteria in maintaining health such as in digestion and in causing diseases such as in streptococcus infections and diphtheria. |